Sigma rule: CVE-2023-40477 Potential Exploitation - .REV File Creation

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-26684f2ec00e, updated 2023-08-31T00:00:00.000Z.

Rule

Title
CVE-2023-40477 Potential Exploitation - .REV File Creation
Status
test
Level
low
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-08-31
File
rules-emerging-threats/2023/Exploits/CVE-2023-40477/file_event_win_exploit_cve_2023_40477_winrar_rev_file_abuse.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the creation of ".rev" files by WinRAR. Could be indicative of potential exploitation of CVE-2023-40477. Look for a suspicious execution shortly after creation or a WinRAR application crash.

Log source

product
windows
category
file_event

Detection

selection:
    Image|endswith:
        - '\explorer.exe' # When extracted via context menu
        - '\WinRAR.exe'
    TargetFilename|endswith: '.rev'
condition: selection

False positives (as the rule lists them)

  • Legitimate extraction of multipart or recovery volumes ZIP files

Tags

  • attack.execution
  • cve.2023-40477
  • detection.emerging-threats

CVEs this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-40477/file_event_win_exploit_cve_2023_40477_winrar_rev_file_abuse.yml

Sources and licences

  • SigmaHQ

    "CVE-2023-40477 Potential Exploitation - .REV File Creation" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-40477/file_event_win_exploit_cve_2023_40477_winrar_rev_file_abuse.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: CVE-2023-40477 Potential Exploitation - .REV File Creation",
entity page, dataset version ref-26684f2ec00e, updated 2023-08-31T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/c3bd6c55-d495-4c34-918e-e03e8828c074 (accessed 2026-11-03).
Underlying source: SigmaHQ rule c3bd6c55-d495-4c34-918e-e03e8828c074, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.